{"id":20289,"date":"2026-04-14T13:20:04","date_gmt":"2026-04-14T13:20:04","guid":{"rendered":"https:\/\/lite14.net\/blog\/?p=20289"},"modified":"2026-04-14T13:20:04","modified_gmt":"2026-04-14T13:20:04","slug":"flexible-ac-transmission-systems-facts","status":"publish","type":"post","link":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/","title":{"rendered":"Flexible AC Transmission Systems (FACTS)"},"content":{"rendered":"<section class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--header-height)\" dir=\"auto\" data-turn-id=\"4d9b3a31-2af9-42a6-904d-0d27b5179432\" data-testid=\"conversation-turn-1\" data-scroll-anchor=\"false\" data-turn=\"user\"><\/section>\n<section class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:a24fc963-7c46-41cb-9440-0e76b528d61f-0\" data-testid=\"conversation-turn-2\" data-scroll-anchor=\"false\" data-turn=\"assistant\">\n<div class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\">\n<div class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\">\n<div class=\"flex max-w-full flex-col gap-4 grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+&amp;]:mt-1\" dir=\"auto\" tabindex=\"0\" data-message-author-role=\"assistant\" data-message-id=\"e3684bf2-da9e-4639-bbad-525b0baf62b0\" data-message-model-slug=\"gpt-5-3-mini\" data-turn-start-message=\"true\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden\">\n<div class=\"markdown prose dark:prose-invert w-full wrap-break-word dark markdown-new-styling\">\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#Flexible_AC_Transmission_Systems_FACTS_A_Complete_Guide\" >Flexible AC Transmission Systems (FACTS): A Complete Guide<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#2_What_is_FACTS\" >2. What is FACTS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#3_Why_FACTS_is_Needed\" >3. Why FACTS is Needed<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#31_Stability_Limits\" >3.1 Stability Limits<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#32_Thermal_Limits\" >3.2 Thermal Limits<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#33_Voltage_Collapse\" >3.3 Voltage Collapse<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#34_Reactive_Power_Imbalance\" >3.4 Reactive Power Imbalance<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#4_Basic_Principle_of_FACTS\" >4. Basic Principle of FACTS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#5_Types_of_FACTS_Controllers\" >5. Types of FACTS Controllers<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#51_Series_Controllers\" >5.1 Series Controllers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#52_Shunt_Controllers\" >5.2 Shunt Controllers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#53_Combined_Series-Shunt_Controllers\" >5.3 Combined Series-Shunt Controllers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#54_Combined_Series-Series_Controllers\" >5.4 Combined Series-Series Controllers<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#6_Major_FACTS_Devices\" >6. Major FACTS Devices<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#61_Static_VAR_Compensator_SVC\" >6.1 Static VAR Compensator (SVC)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#62_STATCOM\" >6.2 STATCOM<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#63_Thyristor_Controlled_Series_Capacitor_TCSC\" >6.3 Thyristor Controlled Series Capacitor (TCSC)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#64_Static_Synchronous_Series_Compensator_SSSC\" >6.4 Static Synchronous Series Compensator (SSSC)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#65_Unified_Power_Flow_Controller_UPFC\" >6.5 Unified Power Flow Controller (UPFC)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#7_Working_of_FACTS_Devices\" >7. Working of FACTS Devices<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#Basic_Operation_Steps\" >Basic Operation Steps:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#8_Advantages_of_FACTS\" >8. Advantages of FACTS<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#81_Increased_Transmission_Capacity\" >8.1 Increased Transmission Capacity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#82_Improved_Voltage_Stability\" >8.2 Improved Voltage Stability<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#83_Enhanced_System_Reliability\" >8.3 Enhanced System Reliability<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#84_Better_Power_Flow_Control\" >8.4 Better Power Flow Control<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#85_Reduced_Need_for_New_Transmission_Lines\" >8.5 Reduced Need for New Transmission Lines<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#86_Improved_Transient_Stability\" >8.6 Improved Transient Stability<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#9_Limitations_of_FACTS\" >9. Limitations of FACTS<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#91_High_Cost\" >9.1 High Cost<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#92_Complex_Control_Systems\" >9.2 Complex Control Systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#93_Maintenance_Requirements\" >9.3 Maintenance Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#94_Limited_Overload_Capability\" >9.4 Limited Overload Capability<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#10_Applications_of_FACTS\" >10. Applications of FACTS<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#101_Power_Transmission_Systems\" >10.1 Power Transmission Systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#102_Renewable_Energy_Integration\" >10.2 Renewable Energy Integration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#103_Industrial_Power_Systems\" >10.3 Industrial Power Systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#104_Grid_Stability_Enhancement\" >10.4 Grid Stability Enhancement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#105_Load_Flow_Management\" >10.5 Load Flow Management<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#11_FACTS_in_Modern_Smart_Grids\" >11. FACTS in Modern Smart Grids<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#12_Comparison_with_HVDC_Systems\" >12. Comparison with HVDC Systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#13_Future_of_FACTS_Technology\" >13. Future of FACTS Technology<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#131_Power_Electronics\" >13.1 Power Electronics<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#132_Artificial_Intelligence\" >13.2 Artificial Intelligence<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-45\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#133_Renewable_Energy_Expansion\" >13.3 Renewable Energy Expansion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-46\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#134_Smart_Grid_Integration\" >13.4 Smart Grid Integration<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-47\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#History_of_Flexible_AC_Transmission_Systems_FACTS_with_Case_Study\" >History of Flexible AC Transmission Systems (FACTS) with Case Study<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-48\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#2_Early_Background_Before_FACTS_Pre-1970s_to_1980s\" >2. Early Background: Before FACTS (Pre-1970s to 1980s)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-49\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#3_Birth_of_FACTS_Concept_1980s\" >3. Birth of FACTS Concept (1980s)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-50\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#4_Evolution_of_FACTS_Technology\" >4. Evolution of FACTS Technology<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-51\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#41_First_Generation_Thyristor-Based_FACTS_1980s%E2%80%931990s\" >4.1 First Generation: Thyristor-Based FACTS (1980s\u20131990s)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-52\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#42_Second_Generation_Voltage_Source_Converter_VSC_FACTS_1990s%E2%80%932000s\" >4.2 Second Generation: Voltage Source Converter (VSC) FACTS (1990s\u20132000s)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-53\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#43_Unified_Power_Flow_Controller_UPFC\" >4.3 Unified Power Flow Controller (UPFC)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-54\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#5_Modern_FACTS_Era_2000s%E2%80%93Present\" >5. Modern FACTS Era (2000s\u2013Present)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-55\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#6_Applications_of_FACTS\" >6. Applications of FACTS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-56\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#7_Case_Study_STATCOM_Installation_in_the_Indian_Power_Grid\" >7. Case Study: STATCOM Installation in the Indian Power Grid<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-57\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#71_Background\" >7.1 Background<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-58\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#72_Problem_Identification\" >7.2 Problem Identification<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-59\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#73_Solution_Implemented\" >7.3 Solution Implemented<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-60\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#74_Technical_Performance\" >7.4 Technical Performance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-61\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#75_Operational_Impact\" >7.5 Operational Impact<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-62\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#76_Lessons_Learned\" >7.6 Lessons Learned<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-63\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#8_Other_Global_Case_Studies_Brief_Overview\" >8. Other Global Case Studies (Brief Overview)<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-64\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#81_United_States_%E2%80%93_SVC_in_Tennessee_Valley_Authority_TVA\" >8.1 United States \u2013 SVC in Tennessee Valley Authority (TVA)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-65\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#82_Brazil_%E2%80%93_Series_Compensation_in_Long_Transmission_Lines\" >8.2 Brazil \u2013 Series Compensation in Long Transmission Lines<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-66\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#83_China_%E2%80%93_Ultra_High_Voltage_UHV_Grid_FACTS_Integration\" >8.3 China \u2013 Ultra High Voltage (UHV) Grid FACTS Integration<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-67\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#9_Advantages_of_FACTS_Technology\" >9. Advantages of FACTS Technology<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-68\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#10_Limitations_of_FACTS\" >10. Limitations of FACTS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-69\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#11_Future_of_FACTS\" >11. Future of FACTS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-70\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#12_Conclusion\" >12. Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 data-start=\"0\" data-end=\"60\"><span class=\"ez-toc-section\" id=\"Flexible_AC_Transmission_Systems_FACTS_A_Complete_Guide\"><\/span>Flexible AC Transmission Systems (FACTS): A Complete Guide<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"82\" data-end=\"432\">Modern power systems are expected to transmit large amounts of electrical energy over long distances while maintaining stability, reliability, and efficiency. However, traditional alternating current (AC) transmission networks face inherent limitations such as voltage instability, power flow constraints, and poor controllability of line parameters.<\/p>\n<p data-start=\"434\" data-end=\"696\">To overcome these challenges, <strong data-start=\"464\" data-end=\"508\">Flexible AC Transmission Systems (FACTS)<\/strong> were developed. FACTS is a collection of power electronic-based systems and devices used to enhance controllability and increase the power transfer capability of AC transmission networks.<\/p>\n<p data-start=\"698\" data-end=\"877\">In simple terms, FACTS technologies allow operators to \u201ccontrol electricity flow like a software-controlled system,\u201d improving performance without building new transmission lines.<\/p>\n<hr data-start=\"879\" data-end=\"882\" \/>\n<h2 data-start=\"884\" data-end=\"904\"><span class=\"ez-toc-section\" id=\"2_What_is_FACTS\"><\/span>2. What is FACTS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"906\" data-end=\"1077\">Flexible AC Transmission Systems (FACTS) refer to <strong data-start=\"956\" data-end=\"1067\">a set of static devices that use power electronics to control one or more AC transmission system parameters<\/strong>, such as:<\/p>\n<ul data-start=\"1079\" data-end=\"1135\">\n<li data-start=\"1079\" data-end=\"1100\">Voltage magnitude<\/li>\n<li data-start=\"1101\" data-end=\"1119\">Line impedance<\/li>\n<li data-start=\"1120\" data-end=\"1135\">Phase angle<\/li>\n<\/ul>\n<p data-start=\"1137\" data-end=\"1202\">By adjusting these parameters dynamically, FACTS devices improve:<\/p>\n<ul data-start=\"1204\" data-end=\"1349\">\n<li data-start=\"1204\" data-end=\"1233\">Power transfer capability<\/li>\n<li data-start=\"1234\" data-end=\"1254\">System stability<\/li>\n<li data-start=\"1255\" data-end=\"1277\">Voltage regulation<\/li>\n<li data-start=\"1278\" data-end=\"1305\">Damping of oscillations<\/li>\n<li data-start=\"1306\" data-end=\"1349\">Load sharing between transmission lines<\/li>\n<\/ul>\n<p data-start=\"1351\" data-end=\"1493\">FACTS is especially useful in heavily loaded grids where adding new transmission lines is expensive, difficult, or environmentally restricted.<\/p>\n<hr data-start=\"1495\" data-end=\"1498\" \/>\n<h2 data-start=\"1500\" data-end=\"1525\"><span class=\"ez-toc-section\" id=\"3_Why_FACTS_is_Needed\"><\/span>3. Why FACTS is Needed<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"1527\" data-end=\"1588\">Power systems are subject to several operational constraints:<\/p>\n<h3 data-start=\"1590\" data-end=\"1614\"><span class=\"ez-toc-section\" id=\"31_Stability_Limits\"><\/span>3.1 Stability Limits<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1615\" data-end=\"1738\">Power systems must maintain synchronism between generators. Disturbances like faults or load changes can cause instability.<\/p>\n<h3 data-start=\"1740\" data-end=\"1762\"><span class=\"ez-toc-section\" id=\"32_Thermal_Limits\"><\/span>3.2 Thermal Limits<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1763\" data-end=\"1857\">Transmission lines have maximum current ratings. Exceeding them causes overheating and damage.<\/p>\n<h3 data-start=\"1859\" data-end=\"1883\"><span class=\"ez-toc-section\" id=\"33_Voltage_Collapse\"><\/span>3.3 Voltage Collapse<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1884\" data-end=\"1965\">In heavily loaded systems, voltage can drop uncontrollably, leading to blackouts.<\/p>\n<h3 data-start=\"1967\" data-end=\"1999\"><span class=\"ez-toc-section\" id=\"34_Reactive_Power_Imbalance\"><\/span>3.4 Reactive Power Imbalance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2000\" data-end=\"2070\">Poor reactive power management reduces efficiency and voltage quality.<\/p>\n<p data-start=\"2072\" data-end=\"2155\">FACTS devices help mitigate all these issues by dynamically controlling power flow.<\/p>\n<hr data-start=\"2157\" data-end=\"2160\" \/>\n<h2 data-start=\"2162\" data-end=\"2192\"><span class=\"ez-toc-section\" id=\"4_Basic_Principle_of_FACTS\"><\/span>4. Basic Principle of FACTS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"2194\" data-end=\"2244\">The power transmitted over an AC line is given by:<\/p>\n<p><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">P=V1V2Xsin\u2061(\u03b4)P = \\frac{V_1 V_2}{X} \\sin(\\delta)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">P<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"mord mathnormal\">X<\/span><span class=\"mord mathnormal\">V<\/span><span class=\"msupsub\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"mord mathnormal\">V<\/span><span class=\"msupsub\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mop\">sin<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">\u03b4<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span><\/p>\n<p data-start=\"2288\" data-end=\"2294\">Where:<\/p>\n<ul data-start=\"2295\" data-end=\"2427\">\n<li data-start=\"2295\" data-end=\"2352\"><span class=\"katex\"><span class=\"katex-mathml\">V1,V2V_1, V_2<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">V<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mpunct\">,<\/span><span class=\"mord\"><span class=\"mord mathnormal\">V<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> = voltages at sending and receiving ends<\/li>\n<li data-start=\"2353\" data-end=\"2392\"><span class=\"katex\"><span class=\"katex-mathml\">XX<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">X<\/span><\/span><\/span><\/span> = transmission line reactance<\/li>\n<li data-start=\"2393\" data-end=\"2427\"><span class=\"katex\"><span class=\"katex-mathml\">\u03b4\u03b4<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">\u03b4<\/span><\/span><\/span><\/span> = phase angle difference<\/li>\n<\/ul>\n<p data-start=\"2429\" data-end=\"2482\">FACTS devices modify one or more of these parameters:<\/p>\n<ul data-start=\"2484\" data-end=\"2618\">\n<li data-start=\"2484\" data-end=\"2525\">Voltage (V) \u2192 voltage control devices<\/li>\n<li data-start=\"2526\" data-end=\"2573\">Reactance (X) \u2192 series compensation devices<\/li>\n<li data-start=\"2574\" data-end=\"2618\">Phase angle (\u03b4) \u2192 phase shifting devices<\/li>\n<\/ul>\n<p data-start=\"2620\" data-end=\"2683\">This direct control of power flow is what makes FACTS powerful.<\/p>\n<hr data-start=\"2685\" data-end=\"2688\" \/>\n<h2 data-start=\"2690\" data-end=\"2722\"><span class=\"ez-toc-section\" id=\"5_Types_of_FACTS_Controllers\"><\/span>5. Types of FACTS Controllers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"2724\" data-end=\"2786\">FACTS devices are broadly classified into <strong data-start=\"2766\" data-end=\"2785\">four categories<\/strong>:<\/p>\n<h3 data-start=\"2788\" data-end=\"2814\"><span class=\"ez-toc-section\" id=\"51_Series_Controllers\"><\/span>5.1 Series Controllers<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2815\" data-end=\"2938\">These are connected in series with the transmission line. They inject voltage in series to control impedance or power flow.<\/p>\n<p data-start=\"2940\" data-end=\"2949\">Examples:<\/p>\n<ul data-start=\"2950\" data-end=\"3043\">\n<li data-start=\"2950\" data-end=\"2996\">Static Synchronous Series Compensator (SSSC)<\/li>\n<li data-start=\"2997\" data-end=\"3043\">Thyristor Controlled Series Capacitor (TCSC)<\/li>\n<\/ul>\n<p data-start=\"3045\" data-end=\"3058\"><strong data-start=\"3045\" data-end=\"3058\">Function:<\/strong><\/p>\n<ul data-start=\"3059\" data-end=\"3129\">\n<li data-start=\"3059\" data-end=\"3092\">Reduce effective line reactance<\/li>\n<li data-start=\"3093\" data-end=\"3129\">Increase power transfer capability<\/li>\n<\/ul>\n<hr data-start=\"3131\" data-end=\"3134\" \/>\n<h3 data-start=\"3136\" data-end=\"3161\"><span class=\"ez-toc-section\" id=\"52_Shunt_Controllers\"><\/span>5.2 Shunt Controllers<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3162\" data-end=\"3229\">These are connected in parallel (shunt) with the transmission line.<\/p>\n<p data-start=\"3231\" data-end=\"3240\">Examples:<\/p>\n<ul data-start=\"3241\" data-end=\"3326\">\n<li data-start=\"3241\" data-end=\"3286\"><span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">Static VAR Compensator<\/span><\/span> (SVC)<\/li>\n<li data-start=\"3287\" data-end=\"3326\"><span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">STATCOM<\/span><\/span><\/li>\n<\/ul>\n<p data-start=\"3328\" data-end=\"3341\"><strong data-start=\"3328\" data-end=\"3341\">Function:<\/strong><\/p>\n<ul data-start=\"3342\" data-end=\"3419\">\n<li data-start=\"3342\" data-end=\"3362\">Voltage regulation<\/li>\n<li data-start=\"3363\" data-end=\"3392\">Reactive power compensation<\/li>\n<li data-start=\"3393\" data-end=\"3419\">Power factor improvement<\/li>\n<\/ul>\n<hr data-start=\"3421\" data-end=\"3424\" \/>\n<h3 data-start=\"3426\" data-end=\"3467\"><span class=\"ez-toc-section\" id=\"53_Combined_Series-Shunt_Controllers\"><\/span>5.3 Combined Series-Shunt Controllers<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3468\" data-end=\"3541\">These combine both series and shunt compensation in a coordinated manner.<\/p>\n<p data-start=\"3543\" data-end=\"3551\">Example:<\/p>\n<ul data-start=\"3552\" data-end=\"3590\">\n<li data-start=\"3552\" data-end=\"3590\">Unified Power Flow Controller (UPFC)<\/li>\n<\/ul>\n<p data-start=\"3592\" data-end=\"3605\"><strong data-start=\"3592\" data-end=\"3605\">Function:<\/strong><\/p>\n<ul data-start=\"3606\" data-end=\"3689\">\n<li data-start=\"3606\" data-end=\"3659\">Full control of voltage, impedance, and phase angle<\/li>\n<li data-start=\"3660\" data-end=\"3689\">Most versatile FACTS device<\/li>\n<\/ul>\n<hr data-start=\"3691\" data-end=\"3694\" \/>\n<h3 data-start=\"3696\" data-end=\"3738\"><span class=\"ez-toc-section\" id=\"54_Combined_Series-Series_Controllers\"><\/span>5.4 Combined Series-Series Controllers<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3739\" data-end=\"3816\">These involve coordination of multiple series controllers in different lines.<\/p>\n<p data-start=\"3818\" data-end=\"3826\">Example:<\/p>\n<ul data-start=\"3827\" data-end=\"3867\">\n<li data-start=\"3827\" data-end=\"3867\">Interline Power Flow Controller (IPFC)<\/li>\n<\/ul>\n<p data-start=\"3869\" data-end=\"3882\"><strong data-start=\"3869\" data-end=\"3882\">Function:<\/strong><\/p>\n<ul data-start=\"3883\" data-end=\"3938\">\n<li data-start=\"3883\" data-end=\"3938\">Balance power flow across multiple transmission lines<\/li>\n<\/ul>\n<hr data-start=\"3940\" data-end=\"3943\" \/>\n<h2 data-start=\"3945\" data-end=\"3970\"><span class=\"ez-toc-section\" id=\"6_Major_FACTS_Devices\"><\/span>6. Major FACTS Devices<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"3972\" data-end=\"4008\"><span class=\"ez-toc-section\" id=\"61_Static_VAR_Compensator_SVC\"><\/span>6.1 Static VAR Compensator (SVC)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4009\" data-end=\"4110\">An SVC uses thyristor-controlled reactors and capacitors to provide fast reactive power compensation.<\/p>\n<p data-start=\"4112\" data-end=\"4127\"><strong data-start=\"4112\" data-end=\"4127\">Advantages:<\/strong><\/p>\n<ul data-start=\"4128\" data-end=\"4198\">\n<li data-start=\"4128\" data-end=\"4143\">Fast response<\/li>\n<li data-start=\"4144\" data-end=\"4172\">Improves voltage stability<\/li>\n<li data-start=\"4173\" data-end=\"4198\">Reduces voltage flicker<\/li>\n<\/ul>\n<p data-start=\"4200\" data-end=\"4217\"><strong data-start=\"4200\" data-end=\"4217\">Applications:<\/strong><\/p>\n<ul data-start=\"4218\" data-end=\"4271\">\n<li data-start=\"4218\" data-end=\"4232\">Steel plants<\/li>\n<li data-start=\"4233\" data-end=\"4258\">Long transmission lines<\/li>\n<li data-start=\"4259\" data-end=\"4271\">Weak grids<\/li>\n<\/ul>\n<hr data-start=\"4273\" data-end=\"4276\" \/>\n<h3 data-start=\"4278\" data-end=\"4293\"><span class=\"ez-toc-section\" id=\"62_STATCOM\"><\/span>6.2 STATCOM<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4294\" data-end=\"4386\">A STATCOM is a voltage source converter-based device that injects or absorbs reactive power.<\/p>\n<p data-start=\"4388\" data-end=\"4405\"><strong data-start=\"4388\" data-end=\"4405\">Key features:<\/strong><\/p>\n<ul data-start=\"4406\" data-end=\"4491\">\n<li data-start=\"4406\" data-end=\"4450\">Better performance than SVC at low voltage<\/li>\n<li data-start=\"4451\" data-end=\"4467\">Compact design<\/li>\n<li data-start=\"4468\" data-end=\"4491\">Fast dynamic response<\/li>\n<\/ul>\n<p data-start=\"4493\" data-end=\"4510\"><strong data-start=\"4493\" data-end=\"4510\">Applications:<\/strong><\/p>\n<ul data-start=\"4511\" data-end=\"4585\">\n<li data-start=\"4511\" data-end=\"4541\">Renewable energy integration<\/li>\n<li data-start=\"4542\" data-end=\"4561\">Weak grid support<\/li>\n<li data-start=\"4562\" data-end=\"4585\">Voltage stabilization<\/li>\n<\/ul>\n<hr data-start=\"4587\" data-end=\"4590\" \/>\n<h3 data-start=\"4592\" data-end=\"4644\"><span class=\"ez-toc-section\" id=\"63_Thyristor_Controlled_Series_Capacitor_TCSC\"><\/span>6.3 Thyristor Controlled Series Capacitor (TCSC)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4645\" data-end=\"4748\">TCSC is a series compensation device that adjusts line reactance using thyristor-controlled capacitors.<\/p>\n<p data-start=\"4750\" data-end=\"4763\"><strong data-start=\"4750\" data-end=\"4763\">Benefits:<\/strong><\/p>\n<ul data-start=\"4764\" data-end=\"4847\">\n<li data-start=\"4764\" data-end=\"4797\">Increases transmission capacity<\/li>\n<li data-start=\"4798\" data-end=\"4826\">Dampens power oscillations<\/li>\n<li data-start=\"4827\" data-end=\"4847\">Improves stability<\/li>\n<\/ul>\n<hr data-start=\"4849\" data-end=\"4852\" \/>\n<h3 data-start=\"4854\" data-end=\"4906\"><span class=\"ez-toc-section\" id=\"64_Static_Synchronous_Series_Compensator_SSSC\"><\/span>6.4 Static Synchronous Series Compensator (SSSC)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4907\" data-end=\"4991\">SSSC injects a controllable voltage in series with the line using power electronics.<\/p>\n<p data-start=\"4993\" data-end=\"5008\"><strong data-start=\"4993\" data-end=\"5008\">Advantages:<\/strong><\/p>\n<ul data-start=\"5009\" data-end=\"5096\">\n<li data-start=\"5009\" data-end=\"5044\">Independent control of power flow<\/li>\n<li data-start=\"5045\" data-end=\"5065\">Flexible operation<\/li>\n<li data-start=\"5066\" data-end=\"5096\">No bulky capacitors required<\/li>\n<\/ul>\n<hr data-start=\"5098\" data-end=\"5101\" \/>\n<h3 data-start=\"5103\" data-end=\"5147\"><span class=\"ez-toc-section\" id=\"65_Unified_Power_Flow_Controller_UPFC\"><\/span>6.5 Unified Power Flow Controller (UPFC)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5148\" data-end=\"5225\">UPFC is the most advanced FACTS device combining shunt and series converters.<\/p>\n<p data-start=\"5227\" data-end=\"5242\">It can control:<\/p>\n<ul data-start=\"5243\" data-end=\"5283\">\n<li data-start=\"5243\" data-end=\"5252\">Voltage<\/li>\n<li data-start=\"5253\" data-end=\"5269\">Line impedance<\/li>\n<li data-start=\"5270\" data-end=\"5283\">Phase angle<\/li>\n<\/ul>\n<p data-start=\"5285\" data-end=\"5302\"><strong data-start=\"5285\" data-end=\"5302\">Capabilities:<\/strong><\/p>\n<ul data-start=\"5303\" data-end=\"5384\">\n<li data-start=\"5303\" data-end=\"5331\">Full control of power flow<\/li>\n<li data-start=\"5332\" data-end=\"5363\">Real-time system optimization<\/li>\n<li data-start=\"5364\" data-end=\"5384\">Enhanced stability<\/li>\n<\/ul>\n<hr data-start=\"5386\" data-end=\"5389\" \/>\n<h2 data-start=\"5391\" data-end=\"5421\"><span class=\"ez-toc-section\" id=\"7_Working_of_FACTS_Devices\"><\/span>7. Working of FACTS Devices<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"5423\" data-end=\"5503\">FACTS devices operate using <strong data-start=\"5451\" data-end=\"5482\">power electronic converters<\/strong>, typically based on:<\/p>\n<ul data-start=\"5505\" data-end=\"5600\">\n<li data-start=\"5505\" data-end=\"5552\">Thyristors (for older devices like SVC, TCSC)<\/li>\n<li data-start=\"5553\" data-end=\"5600\">IGBTs (for modern devices like STATCOM, UPFC)<\/li>\n<\/ul>\n<h3 data-start=\"5602\" data-end=\"5628\"><span class=\"ez-toc-section\" id=\"Basic_Operation_Steps\"><\/span>Basic Operation Steps:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol data-start=\"5629\" data-end=\"5803\">\n<li data-start=\"5629\" data-end=\"5687\">Measure system parameters (voltage, current, frequency)<\/li>\n<li data-start=\"5688\" data-end=\"5720\">Compare with reference values<\/li>\n<li data-start=\"5721\" data-end=\"5747\">Compute control signals<\/li>\n<li data-start=\"5748\" data-end=\"5803\">Power electronics inject or absorb power accordingly<\/li>\n<\/ol>\n<p data-start=\"5805\" data-end=\"5868\">This closed-loop control makes FACTS systems fast and adaptive.<\/p>\n<hr data-start=\"5870\" data-end=\"5873\" \/>\n<h2 data-start=\"5875\" data-end=\"5900\"><span class=\"ez-toc-section\" id=\"8_Advantages_of_FACTS\"><\/span>8. Advantages of FACTS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"5902\" data-end=\"5946\">FACTS technology provides multiple benefits:<\/p>\n<h3 data-start=\"5948\" data-end=\"5987\"><span class=\"ez-toc-section\" id=\"81_Increased_Transmission_Capacity\"><\/span>8.1 Increased Transmission Capacity<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5988\" data-end=\"6093\">By reducing line impedance and improving stability, more power can be transmitted through existing lines.<\/p>\n<h3 data-start=\"6095\" data-end=\"6129\"><span class=\"ez-toc-section\" id=\"82_Improved_Voltage_Stability\"><\/span>8.2 Improved Voltage Stability<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6130\" data-end=\"6187\">FACTS devices maintain voltage levels within safe limits.<\/p>\n<h3 data-start=\"6189\" data-end=\"6224\"><span class=\"ez-toc-section\" id=\"83_Enhanced_System_Reliability\"><\/span>8.3 Enhanced System Reliability<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6225\" data-end=\"6282\">They reduce the risk of blackouts and cascading failures.<\/p>\n<h3 data-start=\"6284\" data-end=\"6317\"><span class=\"ez-toc-section\" id=\"84_Better_Power_Flow_Control\"><\/span>8.4 Better Power Flow Control<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6318\" data-end=\"6373\">Operators can direct electricity through desired paths.<\/p>\n<h3 data-start=\"6375\" data-end=\"6422\"><span class=\"ez-toc-section\" id=\"85_Reduced_Need_for_New_Transmission_Lines\"><\/span>8.5 Reduced Need for New Transmission Lines<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6423\" data-end=\"6473\">FACTS improves existing infrastructure efficiency.<\/p>\n<h3 data-start=\"6475\" data-end=\"6511\"><span class=\"ez-toc-section\" id=\"86_Improved_Transient_Stability\"><\/span>8.6 Improved Transient Stability<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6512\" data-end=\"6553\">They help damp oscillations after faults.<\/p>\n<hr data-start=\"6555\" data-end=\"6558\" \/>\n<h2 data-start=\"6560\" data-end=\"6586\"><span class=\"ez-toc-section\" id=\"9_Limitations_of_FACTS\"><\/span>9. Limitations of FACTS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"6588\" data-end=\"6641\">Despite their advantages, FACTS also has limitations:<\/p>\n<h3 data-start=\"6643\" data-end=\"6660\"><span class=\"ez-toc-section\" id=\"91_High_Cost\"><\/span>9.1 High Cost<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6661\" data-end=\"6722\">Power electronic equipment and control systems are expensive.<\/p>\n<h3 data-start=\"6724\" data-end=\"6755\"><span class=\"ez-toc-section\" id=\"92_Complex_Control_Systems\"><\/span>9.2 Complex Control Systems<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6756\" data-end=\"6810\">Requires advanced algorithms and real-time monitoring.<\/p>\n<h3 data-start=\"6812\" data-end=\"6844\"><span class=\"ez-toc-section\" id=\"93_Maintenance_Requirements\"><\/span>9.3 Maintenance Requirements<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6845\" data-end=\"6902\">Power electronic components need specialized maintenance.<\/p>\n<h3 data-start=\"6904\" data-end=\"6939\"><span class=\"ez-toc-section\" id=\"94_Limited_Overload_Capability\"><\/span>9.4 Limited Overload Capability<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6940\" data-end=\"6977\">Devices have strict operating limits.<\/p>\n<hr data-start=\"6979\" data-end=\"6982\" \/>\n<h2 data-start=\"6984\" data-end=\"7012\"><span class=\"ez-toc-section\" id=\"10_Applications_of_FACTS\"><\/span>10. Applications of FACTS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"7014\" data-end=\"7049\">FACTS technology is widely used in:<\/p>\n<h3 data-start=\"7051\" data-end=\"7086\"><span class=\"ez-toc-section\" id=\"101_Power_Transmission_Systems\"><\/span>10.1 Power Transmission Systems<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"7087\" data-end=\"7144\">\n<li data-start=\"7087\" data-end=\"7121\">Long-distance high-voltage lines<\/li>\n<li data-start=\"7122\" data-end=\"7144\">Interconnected grids<\/li>\n<\/ul>\n<h3 data-start=\"7146\" data-end=\"7183\"><span class=\"ez-toc-section\" id=\"102_Renewable_Energy_Integration\"><\/span>10.2 Renewable Energy Integration<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"7184\" data-end=\"7217\">\n<li data-start=\"7184\" data-end=\"7196\">Wind farms<\/li>\n<li data-start=\"7197\" data-end=\"7217\">Solar power plants<\/li>\n<\/ul>\n<h3 data-start=\"7219\" data-end=\"7252\"><span class=\"ez-toc-section\" id=\"103_Industrial_Power_Systems\"><\/span>10.3 Industrial Power Systems<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"7253\" data-end=\"7314\">\n<li data-start=\"7253\" data-end=\"7267\">Steel plants<\/li>\n<li data-start=\"7268\" data-end=\"7287\">Mining operations<\/li>\n<li data-start=\"7288\" data-end=\"7314\">Manufacturing industries<\/li>\n<\/ul>\n<h3 data-start=\"7316\" data-end=\"7351\"><span class=\"ez-toc-section\" id=\"104_Grid_Stability_Enhancement\"><\/span>10.4 Grid Stability Enhancement<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"7352\" data-end=\"7394\">\n<li data-start=\"7352\" data-end=\"7372\">Voltage regulation<\/li>\n<li data-start=\"7373\" data-end=\"7394\">Oscillation damping<\/li>\n<\/ul>\n<h3 data-start=\"7396\" data-end=\"7425\"><span class=\"ez-toc-section\" id=\"105_Load_Flow_Management\"><\/span>10.5 Load Flow Management<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"7426\" data-end=\"7474\">\n<li data-start=\"7426\" data-end=\"7474\">Congestion management in transmission networks<\/li>\n<\/ul>\n<hr data-start=\"7476\" data-end=\"7479\" \/>\n<h2 data-start=\"7481\" data-end=\"7515\"><span class=\"ez-toc-section\" id=\"11_FACTS_in_Modern_Smart_Grids\"><\/span>11. FACTS in Modern Smart Grids<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"7517\" data-end=\"7573\">In modern smart grids, FACTS devices play a key role in:<\/p>\n<ul data-start=\"7575\" data-end=\"7711\">\n<li data-start=\"7575\" data-end=\"7606\">Real-time grid optimization<\/li>\n<li data-start=\"7607\" data-end=\"7654\">Integration of distributed energy resources<\/li>\n<li data-start=\"7655\" data-end=\"7681\">Adaptive power routing<\/li>\n<li data-start=\"7682\" data-end=\"7711\">Self-healing grid systems<\/li>\n<\/ul>\n<p data-start=\"7713\" data-end=\"7829\">They are often combined with digital monitoring, AI-based control, and SCADA systems for intelligent grid operation.<\/p>\n<hr data-start=\"7831\" data-end=\"7834\" \/>\n<h2 data-start=\"7836\" data-end=\"7871\"><span class=\"ez-toc-section\" id=\"12_Comparison_with_HVDC_Systems\"><\/span>12. Comparison with HVDC Systems<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"7873\" data-end=\"7939\">While both FACTS and HVDC improve power transmission, they differ:<\/p>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"7941\" data-end=\"8285\">\n<thead data-start=\"7941\" data-end=\"7967\">\n<tr data-start=\"7941\" data-end=\"7967\">\n<th class=\"\" data-start=\"7941\" data-end=\"7951\" data-col-size=\"sm\">Feature<\/th>\n<th class=\"\" data-start=\"7951\" data-end=\"7959\" data-col-size=\"sm\">FACTS<\/th>\n<th class=\"\" data-start=\"7959\" data-end=\"7967\" data-col-size=\"sm\">HVDC<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"7993\" data-end=\"8285\">\n<tr data-start=\"7993\" data-end=\"8039\">\n<td data-start=\"7993\" data-end=\"8000\" data-col-size=\"sm\">Type<\/td>\n<td data-start=\"8000\" data-end=\"8020\" data-col-size=\"sm\">AC system control<\/td>\n<td data-col-size=\"sm\" data-start=\"8020\" data-end=\"8039\">DC transmission<\/td>\n<\/tr>\n<tr data-start=\"8040\" data-end=\"8106\">\n<td data-start=\"8040\" data-end=\"8051\" data-col-size=\"sm\">Function<\/td>\n<td data-start=\"8051\" data-end=\"8073\" data-col-size=\"sm\">Controls power flow<\/td>\n<td data-start=\"8073\" data-end=\"8106\" data-col-size=\"sm\">Transfers power over DC links<\/td>\n<\/tr>\n<tr data-start=\"8107\" data-end=\"8171\">\n<td data-start=\"8107\" data-end=\"8121\" data-col-size=\"sm\">Flexibility<\/td>\n<td data-col-size=\"sm\" data-start=\"8121\" data-end=\"8144\">High within AC grids<\/td>\n<td data-col-size=\"sm\" data-start=\"8144\" data-end=\"8171\">Best for long distances<\/td>\n<\/tr>\n<tr data-start=\"8172\" data-end=\"8225\">\n<td data-start=\"8172\" data-end=\"8179\" data-col-size=\"sm\">Cost<\/td>\n<td data-start=\"8179\" data-end=\"8197\" data-col-size=\"sm\">Lower than HVDC<\/td>\n<td data-start=\"8197\" data-end=\"8225\" data-col-size=\"sm\">Higher installation cost<\/td>\n<\/tr>\n<tr data-start=\"8226\" data-end=\"8285\">\n<td data-start=\"8226\" data-end=\"8240\" data-col-size=\"sm\">Application<\/td>\n<td data-start=\"8240\" data-end=\"8257\" data-col-size=\"sm\">Grid stability<\/td>\n<td data-start=\"8257\" data-end=\"8285\" data-col-size=\"sm\">Long-distance bulk power<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"8287\" data-end=\"8396\">FACTS is preferred for improving existing AC networks, while HVDC is used for new long-distance transmission.<\/p>\n<hr data-start=\"8398\" data-end=\"8401\" \/>\n<h2 data-start=\"8403\" data-end=\"8436\"><span class=\"ez-toc-section\" id=\"13_Future_of_FACTS_Technology\"><\/span>13. Future of FACTS Technology<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"8438\" data-end=\"8495\">The future of FACTS is closely linked to advancements in:<\/p>\n<h3 data-start=\"8497\" data-end=\"8523\"><span class=\"ez-toc-section\" id=\"131_Power_Electronics\"><\/span>13.1 Power Electronics<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"8524\" data-end=\"8596\">\n<li data-start=\"8524\" data-end=\"8565\">Wider use of SiC and GaN semiconductors<\/li>\n<li data-start=\"8566\" data-end=\"8596\">Higher efficiency converters<\/li>\n<\/ul>\n<h3 data-start=\"8598\" data-end=\"8630\"><span class=\"ez-toc-section\" id=\"132_Artificial_Intelligence\"><\/span>13.2 Artificial Intelligence<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"8631\" data-end=\"8688\">\n<li data-start=\"8631\" data-end=\"8656\">Predictive grid control<\/li>\n<li data-start=\"8657\" data-end=\"8688\">Self-optimizing FACTS devices<\/li>\n<\/ul>\n<h3 data-start=\"8690\" data-end=\"8725\"><span class=\"ez-toc-section\" id=\"133_Renewable_Energy_Expansion\"><\/span>13.3 Renewable Energy Expansion<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"8726\" data-end=\"8800\">As grids become more decentralized, FACTS will be essential for stability.<\/p>\n<h3 data-start=\"8802\" data-end=\"8833\"><span class=\"ez-toc-section\" id=\"134_Smart_Grid_Integration\"><\/span>13.4 Smart Grid Integration<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"8834\" data-end=\"8903\">FACTS will become a core part of intelligent, automated grid systems.<\/p>\n<h2 data-start=\"0\" data-end=\"70\"><span class=\"ez-toc-section\" id=\"History_of_Flexible_AC_Transmission_Systems_FACTS_with_Case_Study\"><\/span>History of Flexible AC Transmission Systems (FACTS) with Case Study<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"93\" data-end=\"566\">Flexible AC Transmission Systems (FACTS) refer to a family of power electronic-based devices and systems used to enhance the controllability, stability, and power transfer capability of alternating current (AC) transmission networks. The concept is grounded in the application of high-speed semiconductor switching devices such as thyristors and insulated gate bipolar transistors (IGBTs), which enable rapid control of voltage, impedance, and phase angle in power systems.<\/p>\n<p data-start=\"568\" data-end=\"843\">FACTS technology has become essential in modern electrical grids due to increasing electricity demand, long-distance transmission requirements, integration of renewable energy sources, and the need to improve grid reliability without building entirely new transmission lines.<\/p>\n<hr data-start=\"845\" data-end=\"848\" \/>\n<h3 data-start=\"850\" data-end=\"908\"><span class=\"ez-toc-section\" id=\"2_Early_Background_Before_FACTS_Pre-1970s_to_1980s\"><\/span>2. Early Background: Before FACTS (Pre-1970s to 1980s)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"910\" data-end=\"1019\">Before FACTS emerged, power system control relied mainly on mechanical and electromechanical devices such as:<\/p>\n<ul data-start=\"1021\" data-end=\"1130\">\n<li data-start=\"1021\" data-end=\"1049\">Transformer tap changers<\/li>\n<li data-start=\"1050\" data-end=\"1075\">Shunt capacitor banks<\/li>\n<li data-start=\"1076\" data-end=\"1102\">Synchronous condensers<\/li>\n<li data-start=\"1103\" data-end=\"1130\">Fixed series capacitors<\/li>\n<\/ul>\n<p data-start=\"1132\" data-end=\"1230\">While these devices provided basic voltage and reactive power control, they had major limitations:<\/p>\n<ul data-start=\"1232\" data-end=\"1416\">\n<li data-start=\"1232\" data-end=\"1273\">Slow response time (seconds to minutes)<\/li>\n<li data-start=\"1274\" data-end=\"1304\">Lack of dynamic adaptability<\/li>\n<li data-start=\"1305\" data-end=\"1346\">Limited precision in power flow control<\/li>\n<li data-start=\"1347\" data-end=\"1416\">No real-time stabilization capability during faults or disturbances<\/li>\n<\/ul>\n<p data-start=\"1418\" data-end=\"1697\">During the 1960s and 1970s, power systems became increasingly interconnected and complex. Large-scale blackouts in North America and Europe revealed the need for faster and smarter control mechanisms. This period laid the foundation for power electronics in transmission systems.<\/p>\n<hr data-start=\"1699\" data-end=\"1702\" \/>\n<h3 data-start=\"1704\" data-end=\"1741\"><span class=\"ez-toc-section\" id=\"3_Birth_of_FACTS_Concept_1980s\"><\/span>3. Birth of FACTS Concept (1980s)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1743\" data-end=\"2034\">The formal concept of FACTS was introduced in the 1980s by electrical engineer <strong data-start=\"1822\" data-end=\"1845\">Narain G. Hingorani<\/strong>, often referred to as the &#8220;father of FACTS.&#8221; He proposed that power electronics could be used not just in HVDC (High Voltage Direct Current) systems but also in AC transmission to control:<\/p>\n<ul data-start=\"2036\" data-end=\"2092\">\n<li data-start=\"2036\" data-end=\"2057\">Voltage magnitude<\/li>\n<li data-start=\"2058\" data-end=\"2076\">Line impedance<\/li>\n<li data-start=\"2077\" data-end=\"2092\">Phase angle<\/li>\n<\/ul>\n<p data-start=\"2094\" data-end=\"2234\">This marked a paradigm shift: instead of passively accepting power flows dictated by network physics, operators could actively control them.<\/p>\n<p data-start=\"2236\" data-end=\"2438\">The term FACTS became widely recognized after publications by the <strong data-start=\"2302\" data-end=\"2362\">IEEE (Institute of Electrical and Electronics Engineers)<\/strong> and research laboratories such as EPRI (Electric Power Research Institute).<\/p>\n<hr data-start=\"2440\" data-end=\"2443\" \/>\n<h3 data-start=\"2445\" data-end=\"2481\"><span class=\"ez-toc-section\" id=\"4_Evolution_of_FACTS_Technology\"><\/span>4. Evolution of FACTS Technology<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4 data-start=\"2483\" data-end=\"2545\"><span class=\"ez-toc-section\" id=\"41_First_Generation_Thyristor-Based_FACTS_1980s%E2%80%931990s\"><\/span>4.1 First Generation: Thyristor-Based FACTS (1980s\u20131990s)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"2547\" data-end=\"2624\">The first generation of FACTS devices relied heavily on thyristor technology.<\/p>\n<p data-start=\"2626\" data-end=\"2647\">Key devices included:<\/p>\n<ul data-start=\"2649\" data-end=\"2907\">\n<li data-start=\"2649\" data-end=\"2782\"><strong data-start=\"2651\" data-end=\"2683\">SVC (Static Var Compensator)<\/strong><br data-start=\"2683\" data-end=\"2686\" \/>Provides dynamic reactive power compensation using thyristor-switched capacitors and reactors.<\/li>\n<li data-start=\"2784\" data-end=\"2907\"><strong data-start=\"2786\" data-end=\"2834\">TCSC (Thyristor Controlled Series Capacitor)<\/strong><br data-start=\"2834\" data-end=\"2837\" \/>Controls transmission line impedance by varying series compensation.<\/li>\n<\/ul>\n<p data-start=\"2909\" data-end=\"2946\">These systems significantly improved:<\/p>\n<ul data-start=\"2948\" data-end=\"3021\">\n<li data-start=\"2948\" data-end=\"2969\">Voltage stability<\/li>\n<li data-start=\"2970\" data-end=\"2997\">Power factor correction<\/li>\n<li data-start=\"2998\" data-end=\"3021\">Oscillation damping<\/li>\n<\/ul>\n<p data-start=\"3023\" data-end=\"3104\">However, they were still limited by slower switching and partial controllability.<\/p>\n<hr data-start=\"3106\" data-end=\"3109\" \/>\n<h4 data-start=\"3111\" data-end=\"3189\"><span class=\"ez-toc-section\" id=\"42_Second_Generation_Voltage_Source_Converter_VSC_FACTS_1990s%E2%80%932000s\"><\/span>4.2 Second Generation: Voltage Source Converter (VSC) FACTS (1990s\u20132000s)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"3191\" data-end=\"3267\">With advancements in IGBT technology, fully controllable converters emerged.<\/p>\n<p data-start=\"3269\" data-end=\"3281\">Key devices:<\/p>\n<ul data-start=\"3283\" data-end=\"3552\">\n<li data-start=\"3283\" data-end=\"3433\"><strong data-start=\"3285\" data-end=\"3329\">STATCOM (Static Synchronous Compensator)<\/strong><br data-start=\"3329\" data-end=\"3332\" \/>A shunt-connected device that provides fast reactive power support using voltage source converters.<\/li>\n<li data-start=\"3435\" data-end=\"3552\"><strong data-start=\"3437\" data-end=\"3485\">SSSC (Static Synchronous Series Compensator)<\/strong><br data-start=\"3485\" data-end=\"3488\" \/>Injects controllable voltage in series with transmission line.<\/li>\n<\/ul>\n<p data-start=\"3554\" data-end=\"3576\">These devices offered:<\/p>\n<ul data-start=\"3578\" data-end=\"3728\">\n<li data-start=\"3578\" data-end=\"3610\">Faster response (milliseconds)<\/li>\n<li data-start=\"3611\" data-end=\"3641\">Improved control flexibility<\/li>\n<li data-start=\"3642\" data-end=\"3678\">Smaller footprint compared to SVCs<\/li>\n<li data-start=\"3679\" data-end=\"3728\">Better performance under low voltage conditions<\/li>\n<\/ul>\n<hr data-start=\"3730\" data-end=\"3733\" \/>\n<h4 data-start=\"3735\" data-end=\"3780\"><span class=\"ez-toc-section\" id=\"43_Unified_Power_Flow_Controller_UPFC\"><\/span>4.3 Unified Power Flow Controller (UPFC)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"3782\" data-end=\"3882\">Introduced in the mid-1990s, the <strong data-start=\"3815\" data-end=\"3823\">UPFC<\/strong> is considered the most advanced FACTS device. It combines:<\/p>\n<ul data-start=\"3884\" data-end=\"3947\">\n<li data-start=\"3884\" data-end=\"3916\">Shunt converter (like STATCOM)<\/li>\n<li data-start=\"3917\" data-end=\"3947\">Series converter (like SSSC)<\/li>\n<\/ul>\n<p data-start=\"3949\" data-end=\"3962\">Capabilities:<\/p>\n<ul data-start=\"3964\" data-end=\"4102\">\n<li data-start=\"3964\" data-end=\"3994\">Control of voltage magnitude<\/li>\n<li data-start=\"3995\" data-end=\"4022\">Control of line impedance<\/li>\n<li data-start=\"4023\" data-end=\"4047\">Control of phase angle<\/li>\n<li data-start=\"4048\" data-end=\"4102\">Simultaneous regulation of active and reactive power<\/li>\n<\/ul>\n<p data-start=\"4104\" data-end=\"4217\">The UPFC represents the pinnacle of FACTS integration, enabling full control of power flow in transmission lines.<\/p>\n<hr data-start=\"4219\" data-end=\"4222\" \/>\n<h3 data-start=\"4224\" data-end=\"4263\"><span class=\"ez-toc-section\" id=\"5_Modern_FACTS_Era_2000s%E2%80%93Present\"><\/span>5. Modern FACTS Era (2000s\u2013Present)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4265\" data-end=\"4328\">In the 21st century, FACTS devices have evolved further due to:<\/p>\n<ul data-start=\"4330\" data-end=\"4511\">\n<li data-start=\"4330\" data-end=\"4382\">Wide adoption of renewable energy (wind and solar)<\/li>\n<li data-start=\"4383\" data-end=\"4407\">Smart grid development<\/li>\n<li data-start=\"4408\" data-end=\"4456\">Advances in power semiconductors (SiC devices)<\/li>\n<li data-start=\"4457\" data-end=\"4511\">Digital control systems and AI-based grid management<\/li>\n<\/ul>\n<p data-start=\"4513\" data-end=\"4535\">Modern trends include:<\/p>\n<ul data-start=\"4537\" data-end=\"4694\">\n<li data-start=\"4537\" data-end=\"4586\">Modular multilevel converters (MMC-based FACTS)<\/li>\n<li data-start=\"4587\" data-end=\"4626\">Hybrid FACTS + energy storage systems<\/li>\n<li data-start=\"4627\" data-end=\"4664\">Wide-area monitoring systems (WAMS)<\/li>\n<li data-start=\"4665\" data-end=\"4694\">Integration with HVDC grids<\/li>\n<\/ul>\n<p data-start=\"4696\" data-end=\"4765\">FACTS is now a core component of smart grid infrastructure worldwide.<\/p>\n<hr data-start=\"4767\" data-end=\"4770\" \/>\n<h3 data-start=\"4772\" data-end=\"4800\"><span class=\"ez-toc-section\" id=\"6_Applications_of_FACTS\"><\/span>6. Applications of FACTS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4802\" data-end=\"4836\">FACTS devices are widely used for:<\/p>\n<ul data-start=\"4838\" data-end=\"5178\">\n<li data-start=\"4838\" data-end=\"4887\">Voltage regulation in long transmission lines<\/li>\n<li data-start=\"4888\" data-end=\"4929\">Power flow control in meshed networks<\/li>\n<li data-start=\"4930\" data-end=\"4975\">Stability improvement during disturbances<\/li>\n<li data-start=\"4976\" data-end=\"5036\">Congestion management in deregulated electricity markets<\/li>\n<li data-start=\"5037\" data-end=\"5080\">Integration of renewable energy sources<\/li>\n<li data-start=\"5081\" data-end=\"5114\">Damping of power oscillations<\/li>\n<li data-start=\"5115\" data-end=\"5178\">Increasing transmission capacity without building new lines<\/li>\n<\/ul>\n<hr data-start=\"5180\" data-end=\"5183\" \/>\n<h3 data-start=\"5185\" data-end=\"5249\"><span class=\"ez-toc-section\" id=\"7_Case_Study_STATCOM_Installation_in_the_Indian_Power_Grid\"><\/span>7. Case Study: STATCOM Installation in the Indian Power Grid<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4 data-start=\"5251\" data-end=\"5270\"><span class=\"ez-toc-section\" id=\"71_Background\"><\/span>7.1 Background<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"5272\" data-end=\"5543\">India has one of the largest and most complex power transmission systems in the world, operated primarily by <strong data-start=\"5381\" data-end=\"5432\">Power Grid Corporation of India Limited (PGCIL)<\/strong>. Due to rapid industrial growth and increasing electricity demand, several transmission corridors experienced:<\/p>\n<ul data-start=\"5545\" data-end=\"5668\">\n<li data-start=\"5545\" data-end=\"5568\">Voltage instability<\/li>\n<li data-start=\"5569\" data-end=\"5596\">Reactive power shortage<\/li>\n<li data-start=\"5597\" data-end=\"5616\">Grid congestion<\/li>\n<li data-start=\"5617\" data-end=\"5668\">Frequent low-voltage conditions in load centers<\/li>\n<\/ul>\n<p data-start=\"5670\" data-end=\"5768\">To address these issues, FACTS devices\u2014particularly STATCOMs\u2014were deployed in strategic locations.<\/p>\n<hr data-start=\"5770\" data-end=\"5773\" \/>\n<h4 data-start=\"5775\" data-end=\"5806\"><span class=\"ez-toc-section\" id=\"72_Problem_Identification\"><\/span>7.2 Problem Identification<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"5808\" data-end=\"5952\">One major challenge was observed in the <strong data-start=\"5848\" data-end=\"5882\">Western Regional Grid of India<\/strong>, where long transmission distances and heavy industrial loads led to:<\/p>\n<ul data-start=\"5954\" data-end=\"6090\">\n<li data-start=\"5954\" data-end=\"5989\">Voltage dips during peak demand<\/li>\n<li data-start=\"5990\" data-end=\"6036\">Poor dynamic voltage recovery after faults<\/li>\n<li data-start=\"6037\" data-end=\"6090\">Reduced transfer capability of transmission lines<\/li>\n<\/ul>\n<p data-start=\"6092\" data-end=\"6227\">Conventional solutions like capacitor banks were insufficient because they could not respond fast enough during transient disturbances.<\/p>\n<hr data-start=\"6229\" data-end=\"6232\" \/>\n<h4 data-start=\"6234\" data-end=\"6263\"><span class=\"ez-toc-section\" id=\"73_Solution_Implemented\"><\/span>7.3 Solution Implemented<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"6265\" data-end=\"6339\">PGCIL implemented large-scale <strong data-start=\"6295\" data-end=\"6314\">STATCOM systems<\/strong> at critical substations.<\/p>\n<p data-start=\"6341\" data-end=\"6367\">Key installation features:<\/p>\n<ul data-start=\"6369\" data-end=\"6584\">\n<li data-start=\"6369\" data-end=\"6411\">Voltage Source Converter-based STATCOM<\/li>\n<li data-start=\"6412\" data-end=\"6478\">Dynamic reactive power support (both capacitive and inductive)<\/li>\n<li data-start=\"6479\" data-end=\"6516\">Real-time digital control systems<\/li>\n<li data-start=\"6517\" data-end=\"6584\">Integration with Supervisory Control and Data Acquisition (SCADA)<\/li>\n<\/ul>\n<p data-start=\"6586\" data-end=\"6678\">Example deployment locations included high-load substations in industrial and urban regions.<\/p>\n<hr data-start=\"6680\" data-end=\"6683\" \/>\n<h4 data-start=\"6685\" data-end=\"6715\"><span class=\"ez-toc-section\" id=\"74_Technical_Performance\"><\/span>7.4 Technical Performance<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"6717\" data-end=\"6744\">After STATCOM installation:<\/p>\n<ul data-start=\"6746\" data-end=\"7003\">\n<li data-start=\"6746\" data-end=\"6809\">Voltage recovery time improved from seconds to milliseconds<\/li>\n<li data-start=\"6810\" data-end=\"6863\">Voltage stability margins increased significantly<\/li>\n<li data-start=\"6864\" data-end=\"6911\">Reactive power support became instantaneous<\/li>\n<li data-start=\"6912\" data-end=\"7003\">Transmission line loading capability improved by approximately 10\u201320% in some corridors<\/li>\n<\/ul>\n<p data-start=\"7005\" data-end=\"7122\">The system also helped maintain grid stability during disturbances such as short circuits and sudden load variations.<\/p>\n<hr data-start=\"7124\" data-end=\"7127\" \/>\n<h4 data-start=\"7129\" data-end=\"7156\"><span class=\"ez-toc-section\" id=\"75_Operational_Impact\"><\/span>7.5 Operational Impact<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"7158\" data-end=\"7223\">The introduction of STATCOMs led to several operational benefits:<\/p>\n<ul data-start=\"7225\" data-end=\"7479\">\n<li data-start=\"7225\" data-end=\"7275\">Reduced need for additional transmission lines<\/li>\n<li data-start=\"7276\" data-end=\"7334\">Improved reliability of supply to industrial consumers<\/li>\n<li data-start=\"7335\" data-end=\"7416\">Enhanced renewable energy integration, especially wind farms in western India<\/li>\n<li data-start=\"7417\" data-end=\"7479\">Lower transmission losses due to improved voltage profiles<\/li>\n<\/ul>\n<hr data-start=\"7481\" data-end=\"7484\" \/>\n<h4 data-start=\"7486\" data-end=\"7510\"><span class=\"ez-toc-section\" id=\"76_Lessons_Learned\"><\/span>7.6 Lessons Learned<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"7512\" data-end=\"7552\">The Indian case study demonstrated that:<\/p>\n<ol data-start=\"7554\" data-end=\"7847\">\n<li data-start=\"7554\" data-end=\"7621\">Fast reactive power compensation is essential for modern grids<\/li>\n<li data-start=\"7622\" data-end=\"7719\">FACTS devices are more effective than conventional static compensation in dynamic conditions<\/li>\n<li data-start=\"7720\" data-end=\"7780\">Strategic placement is critical for maximizing benefits<\/li>\n<li data-start=\"7781\" data-end=\"7847\">Integration with grid monitoring systems enhances performance<\/li>\n<\/ol>\n<hr data-start=\"7849\" data-end=\"7852\" \/>\n<h3 data-start=\"7854\" data-end=\"7903\"><span class=\"ez-toc-section\" id=\"8_Other_Global_Case_Studies_Brief_Overview\"><\/span>8. Other Global Case Studies (Brief Overview)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4 data-start=\"7905\" data-end=\"7969\"><span class=\"ez-toc-section\" id=\"81_United_States_%E2%80%93_SVC_in_Tennessee_Valley_Authority_TVA\"><\/span>8.1 United States \u2013 SVC in Tennessee Valley Authority (TVA)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"7971\" data-end=\"8145\">The TVA system implemented SVCs to improve voltage stability in long transmission corridors. Benefits included improved damping of oscillations and enhanced grid reliability.<\/p>\n<h4 data-start=\"8147\" data-end=\"8211\"><span class=\"ez-toc-section\" id=\"82_Brazil_%E2%80%93_Series_Compensation_in_Long_Transmission_Lines\"><\/span>8.2 Brazil \u2013 Series Compensation in Long Transmission Lines<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"8213\" data-end=\"8379\">Brazil uses TCSC devices in long-distance hydroelectric transmission corridors to improve power transfer from remote generation sites to urban centers like S\u00e3o Paulo.<\/p>\n<h4 data-start=\"8381\" data-end=\"8445\"><span class=\"ez-toc-section\" id=\"83_China_%E2%80%93_Ultra_High_Voltage_UHV_Grid_FACTS_Integration\"><\/span>8.3 China \u2013 Ultra High Voltage (UHV) Grid FACTS Integration<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"8447\" data-end=\"8589\">China has integrated STATCOM and SVC devices in its UHV AC and DC systems to stabilize extremely long transmission networks exceeding 1000 km.<\/p>\n<hr data-start=\"8591\" data-end=\"8594\" \/>\n<h3 data-start=\"8596\" data-end=\"8633\"><span class=\"ez-toc-section\" id=\"9_Advantages_of_FACTS_Technology\"><\/span>9. Advantages of FACTS Technology<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"8635\" data-end=\"8846\">\n<li data-start=\"8635\" data-end=\"8664\">Improved system stability<\/li>\n<li data-start=\"8665\" data-end=\"8700\">Increased transmission capacity<\/li>\n<li data-start=\"8701\" data-end=\"8740\">Reduced need for new infrastructure<\/li>\n<li data-start=\"8741\" data-end=\"8769\">Enhanced voltage control<\/li>\n<li data-start=\"8770\" data-end=\"8812\">Better integration of renewable energy<\/li>\n<li data-start=\"8813\" data-end=\"8846\">Real-time system adaptability<\/li>\n<\/ul>\n<hr data-start=\"8848\" data-end=\"8851\" \/>\n<h3 data-start=\"8853\" data-end=\"8881\"><span class=\"ez-toc-section\" id=\"10_Limitations_of_FACTS\"><\/span>10. Limitations of FACTS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"8883\" data-end=\"8944\">Despite its advantages, FACTS technology has some challenges:<\/p>\n<ul data-start=\"8946\" data-end=\"9134\">\n<li data-start=\"8946\" data-end=\"8967\">High initial cost<\/li>\n<li data-start=\"8968\" data-end=\"8995\">Complex control systems<\/li>\n<li data-start=\"8996\" data-end=\"9036\">Requires skilled technical expertise<\/li>\n<li data-start=\"9037\" data-end=\"9077\">Maintenance and cooling requirements<\/li>\n<li data-start=\"9078\" data-end=\"9134\">Limited deployment in developing regions due to cost<\/li>\n<\/ul>\n<hr data-start=\"9136\" data-end=\"9139\" \/>\n<h3 data-start=\"9141\" data-end=\"9164\"><span class=\"ez-toc-section\" id=\"11_Future_of_FACTS\"><\/span>11. Future of FACTS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"9166\" data-end=\"9205\">The future of FACTS is closely tied to:<\/p>\n<ul data-start=\"9207\" data-end=\"9409\">\n<li data-start=\"9207\" data-end=\"9258\">Artificial intelligence-based grid optimization<\/li>\n<li data-start=\"9259\" data-end=\"9296\">Renewable-dominated power systems<\/li>\n<li data-start=\"9297\" data-end=\"9325\">Hybrid AC\/DC smart grids<\/li>\n<li data-start=\"9326\" data-end=\"9356\">Energy storage integration<\/li>\n<li data-start=\"9357\" data-end=\"9409\">Semiconductor advancements (SiC and GaN devices)<\/li>\n<\/ul>\n<p data-start=\"9411\" data-end=\"9502\">Emerging concepts such as \u201cSmart FACTS\u201d will allow self-healing and adaptive grid behavior.<\/p>\n<hr data-start=\"9504\" data-end=\"9507\" \/>\n<h3 data-start=\"9509\" data-end=\"9527\"><span class=\"ez-toc-section\" id=\"12_Conclusion\"><\/span>12. Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"9529\" data-end=\"9818\">Flexible AC Transmission Systems represent one of the most important advancements in modern power engineering. From their conceptual development in the 1980s to today\u2019s advanced converter-based systems, FACTS technology has transformed how power is transmitted, controlled, and stabilized.<\/p>\n<p data-start=\"9820\" data-end=\"10173\">The case study of STATCOM deployment in India demonstrates their practical value in solving real-world grid challenges such as voltage instability and congestion. As global energy systems continue to evolve toward renewable and distributed generation, FACTS will remain a cornerstone technology ensuring efficient, reliable, and flexible power delivery.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Flexible AC Transmission Systems (FACTS): A Complete Guide Modern power systems are expected to transmit large amounts of electrical energy over long distances while maintaining&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[270],"tags":[],"class_list":["post-20289","post","type-post","status-publish","format-standard","hentry","category-digital-marketing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Flexible AC Transmission Systems (FACTS) - Lite14 Tools &amp; Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Flexible AC Transmission Systems (FACTS) - Lite14 Tools &amp; Blog\" \/>\n<meta property=\"og:description\" content=\"Flexible AC Transmission Systems (FACTS): A Complete Guide Modern power systems are expected to transmit large amounts of electrical energy over long distances while maintaining...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/\" \/>\n<meta property=\"og:site_name\" content=\"Lite14 Tools &amp; Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-14T13:20:04+00:00\" \/>\n<meta name=\"author\" content=\"admin2\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin2\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"11 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/\"},\"author\":{\"name\":\"admin2\",\"@id\":\"https:\/\/lite14.net\/blog\/#\/schema\/person\/d6a1796f9bc25df6f1c1086e25575bc5\"},\"headline\":\"Flexible AC Transmission Systems (FACTS)\",\"datePublished\":\"2026-04-14T13:20:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/\"},\"wordCount\":2340,\"publisher\":{\"@id\":\"https:\/\/lite14.net\/blog\/#organization\"},\"articleSection\":[\"Digital Marketing\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/\",\"url\":\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/\",\"name\":\"Flexible AC Transmission Systems (FACTS) - Lite14 Tools &amp; Blog\",\"isPartOf\":{\"@id\":\"https:\/\/lite14.net\/blog\/#website\"},\"datePublished\":\"2026-04-14T13:20:04+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lite14.net\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Flexible AC Transmission Systems (FACTS)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lite14.net\/blog\/#website\",\"url\":\"https:\/\/lite14.net\/blog\/\",\"name\":\"Lite14 Tools &amp; Blog\",\"description\":\"Email Marketing Tools &amp; Digital Marketing Updates\",\"publisher\":{\"@id\":\"https:\/\/lite14.net\/blog\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/lite14.net\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/lite14.net\/blog\/#organization\",\"name\":\"Lite14 Tools &amp; Blog\",\"url\":\"https:\/\/lite14.net\/blog\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lite14.net\/blog\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/lite14.net\/blog\/wp-content\/uploads\/2025\/09\/cropped-lite-logo.png\",\"contentUrl\":\"https:\/\/lite14.net\/blog\/wp-content\/uploads\/2025\/09\/cropped-lite-logo.png\",\"width\":191,\"height\":178,\"caption\":\"Lite14 Tools &amp; Blog\"},\"image\":{\"@id\":\"https:\/\/lite14.net\/blog\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/lite14.net\/blog\/#\/schema\/person\/d6a1796f9bc25df6f1c1086e25575bc5\",\"name\":\"admin2\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lite14.net\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/c9322421da6e8f8d7b53717d553682945f287133799175ee2c385f8408302110?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/c9322421da6e8f8d7b53717d553682945f287133799175ee2c385f8408302110?s=96&d=mm&r=g\",\"caption\":\"admin2\"},\"url\":\"https:\/\/lite14.net\/blog\/author\/admin2\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Flexible AC Transmission Systems (FACTS) - Lite14 Tools &amp; Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/","og_locale":"en_US","og_type":"article","og_title":"Flexible AC Transmission Systems (FACTS) - Lite14 Tools &amp; Blog","og_description":"Flexible AC Transmission Systems (FACTS): A Complete Guide Modern power systems are expected to transmit large amounts of electrical energy over long distances while maintaining...","og_url":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/","og_site_name":"Lite14 Tools &amp; Blog","article_published_time":"2026-04-14T13:20:04+00:00","author":"admin2","twitter_card":"summary_large_image","twitter_misc":{"Written by":"admin2","Est. reading time":"11 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#article","isPartOf":{"@id":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/"},"author":{"name":"admin2","@id":"https:\/\/lite14.net\/blog\/#\/schema\/person\/d6a1796f9bc25df6f1c1086e25575bc5"},"headline":"Flexible AC Transmission Systems (FACTS)","datePublished":"2026-04-14T13:20:04+00:00","mainEntityOfPage":{"@id":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/"},"wordCount":2340,"publisher":{"@id":"https:\/\/lite14.net\/blog\/#organization"},"articleSection":["Digital Marketing"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/","url":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/","name":"Flexible AC Transmission Systems (FACTS) - Lite14 Tools &amp; Blog","isPartOf":{"@id":"https:\/\/lite14.net\/blog\/#website"},"datePublished":"2026-04-14T13:20:04+00:00","breadcrumb":{"@id":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/lite14.net\/blog\/2026\/04\/14\/flexible-ac-transmission-systems-facts\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/lite14.net\/blog\/"},{"@type":"ListItem","position":2,"name":"Flexible AC Transmission Systems (FACTS)"}]},{"@type":"WebSite","@id":"https:\/\/lite14.net\/blog\/#website","url":"https:\/\/lite14.net\/blog\/","name":"Lite14 Tools &amp; Blog","description":"Email Marketing Tools &amp; Digital Marketing Updates","publisher":{"@id":"https:\/\/lite14.net\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/lite14.net\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/lite14.net\/blog\/#organization","name":"Lite14 Tools &amp; Blog","url":"https:\/\/lite14.net\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/lite14.net\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/lite14.net\/blog\/wp-content\/uploads\/2025\/09\/cropped-lite-logo.png","contentUrl":"https:\/\/lite14.net\/blog\/wp-content\/uploads\/2025\/09\/cropped-lite-logo.png","width":191,"height":178,"caption":"Lite14 Tools &amp; Blog"},"image":{"@id":"https:\/\/lite14.net\/blog\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/lite14.net\/blog\/#\/schema\/person\/d6a1796f9bc25df6f1c1086e25575bc5","name":"admin2","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/lite14.net\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/c9322421da6e8f8d7b53717d553682945f287133799175ee2c385f8408302110?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/c9322421da6e8f8d7b53717d553682945f287133799175ee2c385f8408302110?s=96&d=mm&r=g","caption":"admin2"},"url":"https:\/\/lite14.net\/blog\/author\/admin2\/"}]}},"_links":{"self":[{"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/posts\/20289","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/comments?post=20289"}],"version-history":[{"count":1,"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/posts\/20289\/revisions"}],"predecessor-version":[{"id":20290,"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/posts\/20289\/revisions\/20290"}],"wp:attachment":[{"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/media?parent=20289"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/categories?post=20289"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lite14.net\/blog\/wp-json\/wp\/v2\/tags?post=20289"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}